cyclesPktKEY
October 11, 2010
1.Plants use CO 2 in the process of
___________________ to make ___________ and
oxygen.
2.Animals use oxygen in the process of
_______________ and make more CO .
2
3.The ____________ is the main regulator of CO
2
in the atmosphere because CO 2 dissolves easily in
it.
4.In the past, huge deposits of carbon were stored
as dead plants and animals __________.
5.Today these deposits are burned as fossil fuels,
which include _____________, _______________,
and ______________.
cyclesPktKEY
October 11, 2010
6.More CO 2 is released in the atmosphere today
than in the past because of _________
___________________ .
7.Another natural source for CO 2 is
__________________.
8.Too much CO 2 in the atmosphere may be
responsible for the _______________ effect.
9. Write the equation for photosynthesis.
10. Draw a simple diagram of the Carbon Cycle
using the words in the text box above.
cyclesPktKEY
October 11, 2010
Carbon Cycle
cyclesPktKEY
October 11, 2010
1.Plants release 430-470 billion tons of oxygen
during process of _________________.
2.Atmospheric oxygen in the form of ___________
provides protection from harmful ultraviolet rays.
3.Oxygen is found everywhere on Earth, from
Earth’s _____________ (rocks) to the
______________ where it is dissolved.
4.Oxygen is vital for ________________ by animals,
a process which produces CO 2.and water.
5.Oxygen is also necessary for the decomposition of
______________ into other elements necessary for
life.
6.Write the equation for respiration.
7.Draw a diagram of the Oxygen Cycle using the
words in the text box.
cyclesPktKEY
October 11, 2010
Oxygen Cycle
cyclesPktKEY
October 11, 2010
Sulfur in a pure elemental state is most often found
near active ________________.
2.Sulfur is found in all of Earth’s environments,
including the air, the hydrosphere (________), the
biosphere (living part), and the lithosphere
(____________or ________).
3.Many sulfates, a solid form of sulfur, come from
chemical weathering of _____________ that contain
sulfur.
4.Another major source of sulfur is from
______________ caused by man-made activities. These
are mixed with water in the air falling in __________ into
water basins.
5.The gas _______ smells like rotten eggs.
6.One of the most important sulfur compounds is
______________ ________, which is used to make
fertilizers, automobile batteries, iron and steel, and
plastics.
7.Other uses for sulfur include ______________ (kills
insects) and __________ (used to start fires).
Make a diagram of where sulfur in found. Hint: See
question #2 above
1.
cyclesPktKEY
October 11, 2010
cyclesPktKEY
October 11, 2010
Phosphorus in NOT found in the free state in Nature, but
is contained mostly in _______ and ______________.
2. It is an essential nutrient for life, as it makes up important
chemicals such as _______.
3. In the Phosphorus Cycle, phosphorus moves between the
soil and ___________, which are eaten by animals. The
animals use phosphorus, and then their ___________
products help return the Sulfur for the next generation of
phosphorus in the soil.
4. Some of the phosphorus in soils can be washed away into
water ___________.
5. Another source of phosphorus in water comes from manmade _____________.
6. Too much phosphorus in water leads to plant
________________, strangling all other life forms in the
water.
7. Why is the use of too much phosphorus-rich fertilizers
bad for the environment?
1.
cyclesPktKEY
October 11, 2010
cyclesPktKEY
October 11, 2010
1. Our atmosphere is ______ nitrogen gas.
2. Animals and plants cannot directly use all the nitrogen
found in our ________________.
3. Only special bacteria can directly use nitrogen in our
atmosphere and “fix” it so other organisms can benefit.
These bacteria are called ____________-_________
bacteria.
4. Higher organisms use nitrogen to make their
_____________.
5. Animal waste decay by the action of bacteria which
create _____________and __________ products rich in
nitrogen, and useful for plants to use again.
6. ______________ bacteria in the soil can break down the
ammonia into the gaseous form of nitrogen, which is not
available for use by plants or animals.
7. In another part of the cycle, animals eat ____________
containing nitrogen, which is again returned to the soil by
animal _____________ or decaying ____________ and
___________.
8. Draw a diagram of the Nitrogen cycle using the words in
the text box.
cyclesPktKEY
October 11, 2010
cyclesPktKEY
October 11, 2010
The transfer of energy in a community can be modeled by _________
__________ and
__________ _________.
.
2. At each transfer along a food chain, energy is lost as ___________ due
to the activities of the organisms as they search for food and mates.
3. _________ _________ are a series of food chains.
4. All food chains begin with a _______________.
5. Virtually all energy available to the biosphere comes from
__________.
6. The energy that is dispersed at each link in the food chain is
constantly renewed by the______.
7. From your text on page 498, label the following (using the text box):
a. Mice, deer __________________ or ___________________
b. Snakes, Hawks __________________ or ___________________
c. Grass, Trees _________________________
d. Fungi/Earthworms ______________________
8. In the space below, draw and label an energy pyramid using the
words in the text box above.
cyclesPktKEY
October 11, 2010
cyclesPktKEY
October 11, 2010